The North Face GTD tank top is a superb technical top with a small knit mesh fabric body that wicks away moisture, mesh underarm and side panels for enhanced breathability and comfort, and a Sanitized Silver antimocrobial treatment that reduces unpleasant odours. The fabrics have built-in UPF 25 sun protection, while the flatlock stitching and wrapped seams add to the already high levels of comfort.GLOSSARY - Wick/Wicking: The act of transferring moisture from the skin to the outer layer of a garment quickly and efficiently, where it evaporates. Provides a drier more comfortable environment inside a piece of clothing.